tree 8b75745c913c33eba2707c3dc5fb0e312bfe3387
parent 3134b9f019f2604f05fd65a2c2d4e57193f7ddfb
parent ea8add2b190395408b22a9127bed2c0912aecbc8
author David S. Miller <davem@davemloft.net> 1455272918 -0500
committer David S. Miller <davem@davemloft.net> 1455272918 -0500

Merge branch 'tcp_dccp_ports'

Eric Dumazet says:

====================
tcp/dccp: better use of ephemeral ports

Big servers have bloated bind table, making very hard to succeed
ephemeral port allocations, without special containers/namespace tricks.

This patch series extends the strategy added in commit 07f4c90062f8
("tcp/dccp: try to not exhaust ip_local_port_range in connect()").

Since ports used by connect() are much likely to be shared among them,
we give a hint to both bind() and connect() to keep the crowds separated
if possible.

Of course, if on a specific host an application needs to allocate ~30000
ports using bind(), it will still be able to do so. Same for ~30000 connect()
to a unique 2-tuple (dst addr, dst port)

New implemetation is also more friendly to softirqs and reschedules.

v2: rebase after TCP SO_REUSEPORT changes
====================

Signed-off-by: David S. Miller <davem@davemloft.net>